A Chinese version of the 12AX7-C. Great for Marshalls and Fenders. Sweet warm mid range tone, complements tone of European amps. A tube that takes some of the edge off of high gain amps by reducing the brightness while still having the gain and articulation. For those that change first stage gain preamp tubes to change the taste and character of their amps (remember, this can be done in less than a minute without tools, adjustments, or a "tech"). This is one tube that should be in your basic toolbox. The basic tube sets generally are the 12AX7C, ECC83, and 7025 to cover a wide range of styles and tastes for most amplifiers.